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By Rachel Nowak in Melbourne AMATEUR conservationists are threatening the survival of the frogs they are trying to help, says an Australian herpetologist. Since the early 1990s, environmentally conscious Australians have been reintroducing tadpoles into ponds and streams in an attempt to bolster flagging populations. But the practice could drive some species of frog to extinction. “There are many risks: gene flow into new areas, the introduction of new species, and obviously the spread of diseases,” says Gerry Marantelli, manager of the Amphibian Research Centre in Melbourne which specialises in frog conservation. Frog numbers have plummeted worldwide in recent years,